Sincere Machinery Launches SM130-130 Two-Stage Strand Pelletizing Line: 450–500 kg/h Recycled PP/PE Processing with Gantry Cutter as the Stability Anchor

Qingdao, China​ — Qingdaosincere Machinery Equipment Co., Ltd. ("Xinsier Machinery") has recently been promoting its SM130-130 Two-Stage Strand Pelletizing Line, a production system designed for recycling post-consumer PP and PE miscellaneous crushed materials. Built around a "two-stage extrusion + strand cooling + gantry cutting" process, the line is rated at 450–500 kg/h​ output 

Two-Stage Extrusion: Degassing First, Then Shaping

The process flow is as follows: belt conveyor feeding → screw loader → SJ130/31 single-screw extruder (132 kW, L/D 31:1)​ → plate-type hydraulic screen changer → SJ130/12 single-screw extruder (45 kW, L/D 12:1)​ → second screen changer → 23-hole strand die → 5 m stainless steel water bath → strand shaking + vortex blower drying → LQ-600 gantry cutter​ → three-layer vibrating screen → pneumatic conveying into a 1 m³ cyclone silo.

The first-stage extruder, with its longer L/D ratio, focuses on melting, mixing, and venting (natural exhaust); the second-stage short-barrel extruder operates at lower pressure and temperature to minimize black spots and strand breakage. Two Φ250 mm plate-type hydraulic screen changers​ (automatic pressure-driven rigid sealing, anti-leakage design) handle the variable impurity levels typical of miscellaneous crushed feedstock.

LQ-600 Gantry Cutter: The "Final Gatekeeper" of Strand Pelletizing

The line is equipped with an LQ-600 gantry-style strand pelletizer​ (RMB 30,000), featuring:

The die produces 23 strands while the cutter is rated for up to 32, leaving headroom for future output upgrades without replacing the pelletizer. Compared with water-ring cutting, strand cooling before cutting reduces moisture entrapment and surface defects, yielding cleaner Φ3×5 mm pellets that command better prices in the recycled resin market.

What Small Recyclers Actually Need: Not "High-End," But "No Breakage"

Located in the Jiaozhou plastics machinery hub of Qingdao, Xinsier Machinery (established 2017) manufactures extrusion lines for pipes, profiles, sheets, and recycling pelletizing. The SM130-130 is positioned squarely at the 2,000–5,000 ton/year​ tier: 2 operators per shift, 3-phase 380 V/50 Hz power (≈316 kW installed, ~70% actual energy consumption), 3 m³/h cooling water at ≤15°C, and a delivery lead time of 70 working days​ after down payment.

"The pain point in recycled pelletizing isn't whether you can make pellets — it's how often you change screens, how often strands break, and whether the pellet length is consistent," noted a plastics machinery industry observer. "Two-stage extrusion plus strand pelletizing with a gantry cutter prioritizes stability and pellet appearance over pushing extreme single-line throughput."

Outlook

As China's recycled plastics sector shifts from "can it be made" to "is it uniform, clean, and cost-effective," manufacturers like Xinsier are betting on mature mid-tier solutions. The strategy is clear: perfect the 400–500 kg/h bracket first, then differentiate on auxiliary details — screen changers, cutters, pneumatic handling — to build word-of-mouth among cost-conscious recyclers.

For more information, contact Qingdao Xinsier Machinery Equipment Co., Ltd. (Unified Credit Code: 91370281MA3DFHHA2G), Beiguan Industrial Park, Jiaozhou, Qingdao, Shandong.

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